This graphic shows standard and OC4J-specific configuration files. At the top are the OC4J server configuration files:
<pre>
server.xml
principals.xml
jms.xml
oc4j-connectors.xml
global-web-application.xml
data-sources.xml
rmi.xml
default-web-site.xml
application.xml
</pre>

At the bottom-left are the J2EE-standard application-level
configuration files:
<pre>
application.xml
web.xml
ejb-jar.xml
application-client.xml
</pre>

At the bottom-right are corresponding OC4J-specific application-level configuration files. Generally speaking, each of these acts as a superset of the associated J2EE-standard file, for adding OC4J-specific application-level information or overriding application-level specifications with deployment-level specifications:
<pre>
orion-application.xml
orion-web.xml
orion-ejb-jar.xml
orion-application-client.xml
oc4j-ra.xml
</pre>